my golf gti is the same, about 2 days of sitting there and its flat. mystified as to what it is. ive got no stereo at all in it yet so cant be that. will try that ignition relay idea and try see if its drawing any power with everything switched off.
all ive got on permanent live is remote central locking, immobilizer and for some random reason the leccy windows have been wired up to permanent live, but cant be them really as its only taking enough power to illuminate the switch